MQ-7 Sensitive Detecting CO Gas

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Brand: Twins Chip
Product Code: MQ-7
Availability: 98

MQ-7 Sensitive Detector Gas Sensor for detecting CO Gas for Arduino


This is a simple to use Carbon Monoxide (CO) sensor, suitable for sensing CO concentrations in the air. The MQ-7 can detect CO-gas concentrations anywhere from 20 to 2000ppm.

This sensor has a high sensitivity and fast response time. The sensor's output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.

The main chips: the LM393, the MQ-7 CO sensor
The working voltage: DC 5 V


1: Signal output instructions.

2: Dual signal output (analog output, and TTL level output)

3: The effective signal of  TTL output is low level . (when Output low level ,the signal light on.can directly connected to the MCU)

4: Analog output 0 to 5V voltage, the higher the concentration ,the higher the voltage.

5: Has a high sensitivity and good selectivity to carbon monoxide .

6: Long life and reliable stability
7: Size: 32mm x22mm x27mm


For the household or environment detection carbon monoxide detection devices. fit for the detection of carbon monoxide and town gas.


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